Meaning

• Agreement or accord.

• A pleasing combination of elements, or arrangement of sounds.

• The academic study of chords.

• Two or more notes played simultaneously to produce a chord.

• The relationship between two distinct musical pitches (musical pitches being frequencies of vibration which produce audible sound) played simultaneously.

• A literary work which brings together or arranges systematically parallel passages of historians respecting the same events, and shows their agreement or consistency.

  "a harmony of the Gospels"